动态加载上传图片

前端

// 就是获取图片的存储路径，让图片标签的src值指向一个后台写流的方法
function showImg(img) {
  let url = img.url
  let path = '/uploadFileFile/getBytesByAbsolutePath?imgPath=' + url
  $('img').attr('src', path)
}

后端

/**
 * @Description: 根据图片的绝对路径返回字节流
 */
@RequestMapping(value = "/getBytesByAbsolutePath")
@ResponseBody
public void getBytesByAbsolutePath(HttpServletRequest request, HttpServletResponse response) throws  Exception{
	String imgPath = request.getParameter("imgPath");
	File file = new File(imgPath);
	if(file.exists()){
		InputStream is = new FileInputStream(file);
		byte[] bytes = new byte[is.available()];
		is.read(bytes);
		is.close();
		OutputStream os = response.getOutputStream();
		response.setContentType("image/*");
		os.write(bytes);
		os.close();
	}else {
		System.out.println("图片不存在");
	}
}